At War with Satan is the third album by heavy metal band Venom. It was released in April 1984. With this album, they returned to the more raw, unpolished sound of Welcome to Hell after the more refined albeit darker and heavier sound of Black Metal. This is especially emphasized with the raspy vocals. Shortly after its release, the HMV and WH Smith record chains withdrew the album from their shelves due to its "controversial content".

The inspiration for writing a track comprising an entire side of the album came from Rush's 2112, one of bassist Conrad Lant's favourite albums of all time. The epic title track was actually never played live until bassist Conrad Lant rearranged it, shortening it by more than half, for his solo project Cronos. It has since then been played live several times by the reformed Venom.